$5\mathrm{.}8\mathrm{.}8$ Which Variables Exist?

$ MathOperations.java

public class Mathoperations

$\{$

private static double PI $=3\mathrm{.}14159$;

public static void main$($String$[]$ args$)$

$\{$

int sumResult $={\displaystyle \underset{?}{\overset{?}{}}}(5,10)$;

int differenceResult $=$ difference $(20,2)$;

double productResult $=$product$(3\mathrm{.}5,2)$;

double circumferenceResult $=$ circlecircumference $(10)$;

double areaResult $=$ circleArea$(12)$;

$\}$

public static int sum$($int one, int two$)$

$\{$

$//$ Printing Variables Example

System.out.println$("$PI: $"+$ PI$)$:

System.out.println $("$one: "I $+$ one$)$;

System.out.println$("$two: $"$H two$)$;

return one $+$ two;

$\}$

public static int difference$($int one, int two$)$

$\{$

$//$ PRINT OUT VARIABLES HERE

return one two;

$\}$

public static double product$($double a$,$ double b$)$

$\{$

double result $=a**b$;

$54$

$5\mathrm{.}5$

$5\mathrm{.}6$

$5\mathrm{.}7$

$58$